HE4000 Encoding System
Glossary
G lossary
GL
A
A
Ampere
AAL1
ATM Adaptation Layer 1.
AAL5
ATM Adaptation Layer 5.
AC
Alternating Current
AC Switching
Power Supply
A pulse-width modulation, AC to DC converter.
ADC
Analog to Digital Converter
ADM
Add/Drop Multiplexer. A device that provides an interface between SONET and
other network signals, converting DSn signals into or from an OC-
n
signal.
AGC
Automatic Gain Control
AIS
Alarm Indication System. A signal comprised of all binary 1s.
AMSL
Above Mean Sea Level
Amp or
Ampere
The standard unit of measure for electrical strength defined as the amount of
current that would be produced by an electromotive force of one volt acting
through a resistance of one ohm.
ANSI
American National Standards Institute
ASCII
American Standard Code for Information Interchange
ASI
Asynchronous serial interface, also referred to as DVB ASI.
ASIC
Application Specific Integrated Circuit
ATE
Automatic Test Equipment
ATM
Asynchronous Transfer Mode. A connection-oriented multiplexing and
switching method with high-speed transmission capability for data, voice and
video.
Auto-Detecting
The capability of a unit to automatically sense and set its configuration to match
the operational parameters of an incoming signal.
Auto-Ranging
The capability of a power supply unit to accept variable voltage rates.
Auto-Sensing
The capability of a power supply unit to detect variable voltage rates.
01-0951-404 Rev B
GL-1